Domain sizing in optical traffic grooming based data center networks

This paper considers an optically groomed data center network (OGDCN), based on a hybrid optical and packet switched architecture. This network uses broadcast domains and wavelength division multiplexing to interconnect all compute storage nodes (CSN). The broadcast domain sizes can be adjusted by reconfiguring optical circuit switches (OCS). Two OCS configurations, Extender and Isolatorm are considered for expanding and shrinking the domain size respectively. A Mixed integer linear programming (MILP) formulation is presented for placement of these configurations in the network given the traffic demands. Two variants — single domain mapping (SDM) and multiple domain mapping (MDM) — are presented and evaluated. It is observed that the MDM variant is better suited for network design and the simpler SDM variant can be used for computing reconfigurations. With 5000 flows, it is shown that OCS reconfiguration is not required with a change in traffic distribution without any change in load.